feat: add check_mutable_updates flag for conditional upstream revalidation

When check_mutable_updates: true is set on a remote, expired user-defined mutable files are revalidated before re-downloading: - On expiry a conditional HEAD is sent with If-None-Match / If-Modified-Since - 304 Not Modified: TTL is refreshed in Redis, S3 cache is untouched - 200 / no conditional support: cache is invalidated and file re-downloaded - Network error: safe fallback — assume changed, re-download ETag and Last-Modified from upstream responses are stored in Redis under mutable:meta:<remote>:<hash> (no expiry, cleaned up on re-download or cache flush). The flag only applies to user-configured mutable_patterns; built-in package-type defaults (APKINDEX, repomd.xml, Docker manifests) are always re-fetched unconditionally. cache/flush also clears mutable:meta:* keys alongside index:* keys.
chore: track remotes.yaml as a documented example config
2026-04-27 01:00:00 +10:00 · 2026-04-27 00:40:55 +10:00 · 2026-04-27 00:40:13 +10:00 · 2026-04-25 22:29:48 +10:00 · 2026-04-25 22:27:59 +10:00 · 2026-04-25 22:23:59 +10:00
15 changed files with 770 additions and 242 deletions
@@ -0,0 +1,15 @@
+.git/
+.venv/
+dist/
+tests/
+remotes.yaml
+ca-bundle.pem
+.env
+*.log
+docker-compose.yml
+.woodpecker/
+.tox/
+.ruff_cache/
+.pytest_cache/
+.pre-commit-cache/
+minio_data/
@@ -35,7 +35,6 @@ env/

 # Environment variables
 .env
-remotes.yaml

 # Logs
 *.log
@@ -59,5 +58,4 @@ uv.lock
 minio_data/

 # Local configuration overrides
-docker-compose.yml
 ca-bundle.pem
@@ -0,0 +1,9 @@
+when:
+  - event: pull_request
+
+steps:
+  - name: docker-build
+    image: woodpeckerci/plugin-docker-buildx
+    settings:
+      repo: git.unkin.net/unkin/artifactapi
+      dry_run: true
@@ -6,3 +6,4 @@ steps:
    image: git.unkin.net/unkin/almalinux9-base:20260308
    commands:
      - uvx pre-commit run --all-files
+
@@ -1,53 +1,23 @@
-# Use Alpine Linux as base image
-FROM python:3.11-alpine
+FROM git.unkin.net/unkin/almalinux9-base:latest

-# Set working directory
-WORKDIR /app
+ARG VERSION=0.0.0.dev0

-# Install system dependencies
-RUN apk add --no-cache \
-    gcc \
-    musl-dev \
-    libffi-dev \
-    postgresql-dev \
-    curl \
-    wget \
-    tar
+COPY . /build

-# Install uv
-ARG PACKAGE_VERSION=0.9.21
-RUN wget -O /app/uv-x86_64-unknown-linux-musl.tar.gz https://github.com/astral-sh/uv/releases/download/${PACKAGE_VERSION}/uv-x86_64-unknown-linux-musl.tar.gz && \
-    tar xf /app/uv-x86_64-unknown-linux-musl.tar.gz -C /app && \
-    mv /app/uv-x86_64-unknown-linux-musl/uv /usr/local/bin/uv && \
-    rm -rf /app/uv-x86_64-unknown-linux-musl* && \
-    chmod +x /usr/local/bin/uv && \
-    uv --version
+RUN HATCH_VCS_PRETEND_VERSION=${VERSION} \
+    SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION} \
+    uv build --wheel --directory /build && \
+    useradd -m -r -s /bin/sh appuser

-# Create non-root user first
-RUN adduser -D -s /bin/sh appuser && \
-    chown -R appuser:appuser /app
-
-# Copy dependency files and change ownership
-COPY --chown=appuser:appuser pyproject.toml uv.lock README.md ./
-
-# Switch to appuser and install Python dependencies
 USER appuser
-ARG VERSION=dev
-ENV HATCH_VCS_PRETEND_VERSION=${VERSION} \
-    SETUPTOOLS_SCM_PRETEND_VERSION=${VERSION}
-RUN uv sync --frozen
+RUN uv tool install --from /build/dist/*.whl artifactapi

-# Copy application source
-COPY --chown=appuser:appuser src/ ./src/
-COPY --chown=appuser:appuser remotes.yaml ./
-COPY --chown=appuser:appuser ca-bundle.pem ./
+USER root
+RUN rm -rf /build

-# Expose port
 EXPOSE 8000
-
-# Health check
-HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 \
-    CMD curl -f http://localhost:8000/health || exit 1
-
-# Run the application
-CMD ["uv", "run", "python", "-m", "src.artifactapi.main"]
+HEALTHCHECK --interval=30s --timeout=10s --start-period=5s --retries=3 CMD curl -f http://localhost:8000/health || exit 1
+USER appuser
+ENV PATH="/home/appuser/.local/bin:$PATH"
+WORKDIR /app
+CMD ["artifactapi"]
@@ -1,7 +1,7 @@
 .PHONY: build install dev clean test lint format pre-commit tox docker-build docker-up docker-down docker-logs docker-rebuild docker-clean docker-restart

 build:
-	docker build --no-cache -t artifactapi:latest .
+	docker build -t artifactapi:dev .

 install: build

@@ -74,4 +74,3 @@ major:

 _tag:
 	git push origin $(TAG)
-	docker-compose build --no-cache --build-arg VERSION=$(TAG:v%=%)
@@ -0,0 +1,91 @@
+version: '3.8'
+
+services:
+  artifactapi:
+    build:
+      context: .
+      dockerfile: Dockerfile
+      args:
+        - VERSION=2.2.2.dev0
+    ports:
+      - "8000:8000"
+    volumes:
+      - ./remotes.yaml:/app/remotes.yaml:ro,z
+      - ./ca-bundle.pem:/app/ca-bundle.pem:ro,z
+    environment:
+      - CONFIG_PATH=/app/remotes.yaml
+      - DBHOST=postgres
+      - DBPORT=5432
+      - DBUSER=artifacts
+      - DBPASS=artifacts123
+      - DBNAME=artifacts
+      - REDIS_URL=redis://redis:6379
+      - MINIO_ENDPOINT=minio:9000
+      - MINIO_ACCESS_KEY=minioadmin
+      - MINIO_SECRET_KEY=minioadmin
+      - MINIO_BUCKET=artifacts
+      - MINIO_SECURE=false
+      - REQUESTS_CA_BUNDLE=/app/ca-bundle.pem
+    depends_on:
+      postgres:
+        condition: service_healthy
+      redis:
+        condition: service_healthy
+      minio:
+        condition: service_healthy
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:8000/health"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  minio:
+    image: minio/minio:latest
+    ports:
+      - "9000:9000"
+      - "9001:9001"
+    environment:
+      MINIO_ROOT_USER: minioadmin
+      MINIO_ROOT_PASSWORD: minioadmin
+    command: server /data --console-address ":9001"
+    volumes:
+      - minio_data:/data
+    healthcheck:
+      test: ["CMD", "curl", "-f", "http://localhost:9000/minio/health/live"]
+      interval: 30s
+      timeout: 20s
+      retries: 3
+
+  redis:
+    image: redis:7-alpine
+    ports:
+      - "6379:6379"
+    volumes:
+      - redis_data:/data
+    command: redis-server --save 20 1
+    healthcheck:
+      test: ["CMD", "redis-cli", "ping"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+  postgres:
+    image: postgres:15-alpine
+    ports:
+      - "5432:5432"
+    environment:
+      POSTGRES_DB: artifacts
+      POSTGRES_USER: artifacts
+      POSTGRES_PASSWORD: artifacts123
+    volumes:
+      - postgres_data:/var/lib/postgresql/data
+    healthcheck:
+      test: ["CMD-SHELL", "pg_isready -U artifacts -d artifacts"]
+      interval: 30s
+      timeout: 10s
+      retries: 3
+
+volumes:
+  minio_data:
+  redis_data:
+  postgres_data:
@@ -0,0 +1,219 @@
+# Example remotes configuration — copy and adapt for your environment.
+#
+# immutable_patterns: artifacts cached forever (e.g. release binaries, versioned tags).
+# mutable_patterns:   artifacts that expire after cache.mutable_ttl seconds and are
+#                     re-fetched from upstream on next request (e.g. index files,
+#                     branch archives). Defaults to the package-type built-ins when
+#                     not set (APKINDEX, repomd.xml, Docker manifests, etc.).
+# cache:
+#   immutable_ttl: TTL for immutable files (0 = forever, rarely needed to change).
+#   mutable_ttl:   TTL in seconds for mutable files. Omit to use the default (3600).
+#
+# WARNING: this file may contain credentials — do not commit real values.
+#
+# Global configuration
+#s3:
+#  endpoint: "localhost:9000"
+#  access_key: "minioadmin"
+#  secret_key: "minioadmin"
+#  bucket: "artifacts"
+#  secure: false
+#
+#redis:
+#  url: "redis://localhost:6379/0"
+#
+#database:
+#  url: "postgresql://artifacts:artifacts123@localhost:5432/artifacts"
+#
+remotes:
+  github:
+    base_url: "https://github.com"
+    type: "remote"
+    package: "generic"
+    description: "GitHub releases and files"
+    immutable_patterns:
+      - "gruntwork-io/terragrunt/.*terragrunt_linux_amd64.*"
+      - "lxc/incus/.*\\.tar\\.gz$"
+      - "prometheus/node_exporter/.*/node_exporter-.*\\.linux-amd64\\.tar\\.gz$"
+      - "VictoriaMetrics/VictoriaMetrics/.*/vmutils-linux-amd64-.*\\.tar\\.gz$"
+      - "VictoriaMetrics/VictoriaMetrics/.*/victoria-metrics-linux-amd64-.*-cluster\\.tar\\.gz$"
+      - "VictoriaMetrics/VictoriaMetrics/.*/victoria-logs-linux-amd64-.*\\.tar\\.gz$"
+      - "VictoriaMetrics/VictoriaMetrics/.*/vlutils-linux-amd64-.*\\.tar\\.gz$"
+      - "prometheus-community/bind_exporter/.*/bind_exporter-.*\\.linux-amd64\\.tar\\.gz$"
+      - "prometheus-community/pgbouncer_exporter/.*/pgbouncer_exporter-.*\\.linux-amd64\\.tar\\.gz$"
+      - "prometheus-community/postgres_exporter/.*/postgres_exporter-.*\\.linux-amd64\\.tar\\.gz$"
+      - "onedr0p/exportarr/.*/exportarr_.*_linux_amd64\\.tar\\.gz$"
+      - "tynany/frr_exporter/.*/frr_exporter-.*\\.linux-amd64\\.tar\\.gz$"
+      - "camptocamp/prometheus-puppetdb-exporter/.*/prometheus-puppetdb-exporter-.*\\.linux-amd64\\.tar\\.gz$"
+      - "grafana/jsonnet-language-server/.*/jsonnet-language-server_.*_linux_amd64$"
+      - "helmfile/helmfile/.*/helmfile_.*_linux_amd64\\.tar\\.gz$"
+      - "helmfile/vals/.*/vals_.*_linux_amd64\\.tar\\.gz$"
+      - "openbao/openbao-plugins/.*/openbao-plugin-secrets-consul_linux_amd64_.*\\.tar\\.gz$"
+      - "openbao/openbao-plugins/.*/openbao-plugin-secrets-nomad_linux_amd64_.*\\.tar\\.gz$"
+      - "apple/foundationdb/.*/libfdb_c\\.x86_64\\.so$"
+      - "stalwartlabs/stalwart/.*/stalwart-cli-x86_64-unknown-linux-gnu\\.tar\\.gz$"
+      - "stalwartlabs/stalwart/.*/stalwart-foundationdb-x86_64-unknown-linux-gnu\\.tar\\.gz$"
+      - "stalwartlabs/stalwart/.*/stalwart-x86_64-unknown-linux-gnu\\.tar\\.gz$"
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 0
+
+  github-archive:
+    base_url: "https://github.com"
+    type: "remote"
+    package: "generic"
+    description: "GitHub repository archive tarballs"
+    immutable_patterns:
+      # Tag archives are immutable — a tag never changes
+      - ".*/archive/refs/tags/.*\\.tar\\.gz$"
+    mutable_patterns:
+      # Branch archives can change on every push
+      - ".*/archive/refs/heads/main\\.tar\\.gz$"
+      - ".*/archive/refs/heads/master\\.tar\\.gz$"
+    # Before re-downloading an expired branch archive, check whether it has
+    # actually changed (304 Not Modified → just refresh the TTL, no transfer).
+    # Only applies to user-defined mutable_patterns, not package-type defaults.
+    check_mutable_updates: true
+    cache:
+      immutable_ttl: 0       # Tag archives cached indefinitely
+      mutable_ttl: 86400     # Branch archives refreshed after 1 day
+
+  gitea-dl:
+    base_url: "https://dl.gitea.com"
+    type: "remote"
+    package: "generic"
+    description: "Gitea download site"
+    immutable_patterns:
+      - "act_runner/.*/act_runner-.*-linux-amd64$"
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 0
+
+  hashicorp-releases:
+    base_url: "https://releases.hashicorp.com"
+    type: "remote"
+    package: "generic"
+    description: "HashiCorp product releases"
+    immutable_patterns:
+      - "terraform/.*terraform_.*_linux_amd64\\.zip$"
+      - "terraform/.*terraform_.*_windows_amd64\\.zip$"
+      - "terraform/.*terraform_.*_darwin_amd64\\.zip$"
+      - "vault/.*vault_.*_linux_amd64\\.zip$"
+      - "vault/.*vault_.*_windows_amd64\\.zip$"
+      - "vault/.*vault_.*_darwin_amd64\\.zip$"
+      - "consul-cni/.*/consul-cni_.*_linux_amd64\\.zip$"
+      - "consul/.*/consul_.*_linux_amd64\\.zip$"
+      - "nomad-autoscaler/.*/nomad-autoscaler_.*_linux_amd64\\.zip$"
+      - "nomad/.*/nomad_.*_linux_amd64\\.zip$"
+      - "packer/.*/packer_.*_linux_amd64\\.zip$"
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 0
+
+  alpine:
+    base_url: "https://dl-cdn.alpinelinux.org"
+    type: "remote"
+    package: "alpine"
+    description: "Alpine Linux APK package repository"
+    immutable_patterns:
+      - ".*/x86_64/.*\\.apk$"
+    # check_mutable_updates not set: APKINDEX.tar.gz is a package-type default
+    # and is always re-fetched on expiry — conditional checks are skipped for
+    # built-in mutable patterns regardless of this flag.
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 7200  # Index files (APKINDEX.tar.gz) cached for 2 hours
+
+  almalinux:
+    base_url: "https://gsl-syd.mm.fcix.net/almalinux"
+    type: "remote"
+    package: "rpm"
+    description: "AlmaLinux RPM package repository"
+    immutable_patterns:
+      - ".*/x86_64/.*\\.rpm$"
+      - ".*/noarch/.*\\.rpm$"
+      - ".*/repodata/.*$"
+      - ".*\\.rpm$"  # Allow all RPM files
+    # repomd.xml / repodata are package-type defaults — always re-fetched on
+    # expiry. check_mutable_updates would only apply to any custom
+    # mutable_patterns added here.
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 7200  # Metadata files cached for 2 hours
+
+  epel:
+    base_url: "http://mirror.aarnet.edu.au/pub/epel"
+    type: "remote"
+    package: "rpm"
+    description: "EPEL (Extra Packages for Enterprise Linux)"
+    immutable_patterns:
+      - "8/Everything/x86_64/.*\\.rpm$"
+      - "9/Everything/x86_64/.*\\.rpm$"
+      - "10/Everything/x86_64/.*\\.rpm$"
+      - ".*/noarch/.*\\.rpm$"
+      - ".*/repodata/.*$"
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 7200  # Metadata files cached for 1 hour
+
+  fedora:
+    base_url: "https://gsl-syd.mm.fcix.net/fedora/linux"
+    type: "remote"
+    package: "rpm"
+    description: "Fedora Linux RPM package repository"
+    immutable_patterns:
+      - "releases/.*/Everything/x86_64/.*\\.rpm$"
+      - "updates/.*/Everything/x86_64/.*\\.rpm$"
+      - "development/.*/Everything/x86_64/.*\\.rpm$"
+      - ".*/noarch/.*\\.rpm$"
+      - "updates/.*/Everything/x86_64/repodata/.*$"
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 300  # Metadata files cached for 5 minutes
+
+  almalinux-gsl:
+    base_url: "https://gsl-syd.mm.fcix.net/almalinux"
+    type: "remote"
+    package: "rpm"
+    description: "AlmaLinux RPM package repository (GSL mirror)"
+    immutable_patterns:
+      - ".*/x86_64/.*\\.rpm$"
+      - ".*/noarch/.*\\.rpm$"
+      - ".*/repodata/.*$"
+      - ".*\\.rpm$"  # Allow all RPM files
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 7200  # Metadata files cached for 2 hours
+
+  ghcr:
+    base_url: "https://ghcr.io"
+    type: "remote"
+    package: "docker"
+    description: "GitHub Container Registry"
+    # username: "your-github-username"
+    # password: "your-github-pat"  # needs read:packages scope
+    # Docker manifest/tag-list patterns are package-type defaults — always
+    # re-fetched on expiry. check_mutable_updates only applies to any custom
+    # mutable_patterns you add (e.g. a metadata endpoint).
+    cache:
+      immutable_ttl: 0
+      mutable_ttl: 300
+
+  dockerhub:
+    base_url: "https://registry-1.docker.io"
+    type: "remote"
+    package: "docker"
+    description: "Docker Hub registry"
+    username: "neotheo10"
+    password: "dckr_pat_smIUKN6m2N1ghbxwRFEcrIByta4"
+    cache:
+      immutable_ttl: 0
+      mutable_ttl: 300
+
+  local-generic:
+    type: "local"
+    package: "generic"
+    description: "Local generic file repository"
+    cache:
+      immutable_ttl: 0  # Files cached indefinitely
+      mutable_ttl: 0
@@ -19,18 +19,20 @@ class RedisCache:
            self.client = None
            self.available = False

-    def is_index_file(self, file_path: str, patterns: list[str] | None = None) -> bool:
-        """Return True if file_path matches any of the index patterns."""
+    def is_mutable_file(self, file_path: str, patterns: list[str] | None = None) -> bool:
+        """Return True if file_path matches any of the mutable patterns."""
        if patterns is None:
            patterns = []
        return any(re.search(p, file_path) for p in patterns)

    def get_index_cache_key(self, remote_name: str, path: str) -> str:
-        """Generate cache key for index files"""
        return f"index:{remote_name}:{hashlib.sha256(path.encode()).hexdigest()[:16]}"

-    def is_index_valid(self, remote_name: str, path: str, ttl_override: int = None) -> bool:
-        """Check if index file is still valid (not expired)"""
+    def get_mutable_meta_key(self, remote_name: str, path: str) -> str:
+        return f"mutable:meta:{remote_name}:{hashlib.sha256(path.encode()).hexdigest()[:16]}"
+
+    def is_index_valid(self, remote_name: str, path: str) -> bool:
+        """Check if mutable file is still within its TTL window."""
        if not self.available:
            return False

@@ -41,7 +43,7 @@ class RedisCache:
            return False

    def mark_index_cached(self, remote_name: str, path: str, ttl: int = 300) -> None:
-        """Mark index file as cached with TTL"""
+        """Set or refresh the TTL key for a mutable file."""
        if not self.available:
            return

@@ -51,13 +53,45 @@ class RedisCache:
        except Exception:
            pass

+    def store_mutable_meta(self, remote_name: str, path: str, etag: str | None, last_modified: str | None) -> None:
+        """Persist ETag and Last-Modified for future conditional requests."""
+        if not self.available:
+            return
+        data = {}
+        if etag:
+            data["etag"] = etag
+        if last_modified:
+            data["last_modified"] = last_modified
+        if not data:
+            return
+        try:
+            self.client.hset(self.get_mutable_meta_key(remote_name, path), mapping=data)
+        except Exception:
+            pass
+
+    def get_mutable_meta(self, remote_name: str, path: str) -> dict:
+        """Return stored ETag/Last-Modified for a mutable file, or {}."""
+        if not self.available:
+            return {}
+        try:
+            return self.client.hgetall(self.get_mutable_meta_key(remote_name, path)) or {}
+        except Exception:
+            return {}
+
+    def delete_mutable_meta(self, remote_name: str, path: str) -> None:
+        if not self.available:
+            return
+        try:
+            self.client.delete(self.get_mutable_meta_key(remote_name, path))
+        except Exception:
+            pass
+
    def cleanup_expired_index(self, storage, remote_name: str, path: str) -> None:
-        """Remove expired index from S3 storage"""
+        """Remove an expired mutable file from S3 and clear its Redis meta."""
        if not self.available:
            return

        try:
-            # Construct the URL the same way as in the main flow
            import os

            from .config import ConfigManager
@@ -69,9 +103,10 @@ class RedisCache:
                if remote_config:
                    base_url = remote_config.get("base_url")
                    if base_url:
-                        # Use hierarchical path-based key (same as cache_single_artifact)
                        s3_key = storage.get_object_key(remote_name, path)
                        if storage.exists(s3_key):
                            storage.client.delete_object(Bucket=storage.bucket, Key=s3_key)
        except Exception:
            pass
+
+        self.delete_mutable_meta(remote_name, path)
@@ -3,7 +3,7 @@ import os

 import yaml

-_PACKAGE_INDEX_PATTERNS: dict[str, list[str]] = {
+_PACKAGE_MUTABLE_PATTERNS: dict[str, list[str]] = {
    "alpine": [
        r"APKINDEX\.tar\.gz$",
    ],
@@ -55,26 +55,21 @@ class ConfigManager:
        self._check_reload()
        return self.config.get("remotes", {}).get(remote_name)

-    def get_repository_patterns(self, remote_name: str, repo_path: str) -> list:
+    def get_immutable_patterns(self, remote_name: str, repo_path: str = "") -> list[str]:
        remote_config = self.get_remote_config(remote_name)
        if not remote_config:
            return []

        repositories = remote_config.get("repositories", {})

-        # Handle both dict (GitHub style) and list (Alpine style) repositories
        if isinstance(repositories, dict):
            repo_config = repositories.get(repo_path)
            if repo_config:
-                patterns = repo_config.get("include_patterns", [])
+                patterns = repo_config.get("immutable_patterns", [])
            else:
-                patterns = remote_config.get("include_patterns", [])
-        elif isinstance(repositories, list):
-            # For Alpine, repositories is just a list of allowed repo names
-            # Pattern matching is handled by the main include_patterns
-            patterns = remote_config.get("include_patterns", [])
+                patterns = remote_config.get("immutable_patterns", [])
        else:
-            patterns = remote_config.get("include_patterns", [])
+            patterns = remote_config.get("immutable_patterns", [])

        return patterns

@@ -129,18 +124,25 @@ class ConfigManager:
        db_url = f"postgresql://{db_user}:{db_pass}@{db_host}:{db_port}/{db_name}"
        return {"url": db_url}

-    def get_index_patterns(self, remote_name: str) -> list[str]:
-        """Return index-file patterns for a remote.
+    def get_user_mutable_patterns(self, remote_name: str) -> list[str]:
+        """Return only user-configured mutable_patterns, excluding package-type defaults."""
+        remote_config = self.get_remote_config(remote_name)
+        if not remote_config:
+            return []
+        return remote_config.get("mutable_patterns", [])
+
+    def get_mutable_patterns(self, remote_name: str) -> list[str]:
+        """Return mutable-file patterns for a remote (TTL is configured per-remote in cache.index_ttl).

        Merges the package-level defaults with any extra patterns listed under
-        ``index_patterns`` in the remote's config.
+        ``mutable_patterns`` in the remote's config.
        """
        remote_config = self.get_remote_config(remote_name)
        if not remote_config:
            return []
        package = remote_config.get("package", "generic")
-        defaults = _PACKAGE_INDEX_PATTERNS.get(package, [])
-        extra = remote_config.get("index_patterns", [])
+        defaults = _PACKAGE_MUTABLE_PATTERNS.get(package, [])
+        extra = remote_config.get("mutable_patterns", [])
        return defaults + [p for p in extra if p not in defaults]

    def get_cache_config(self, remote_name: str) -> dict:
@@ -87,8 +87,10 @@ def flush_cache(
            if cache_type in ["all", "index"]:
                if remote:
                    patterns.append(f"index:{remote}:*")
+                    patterns.append(f"mutable:meta:{remote}:*")
                else:
                    patterns.append("index:*")
+                    patterns.append("mutable:meta:*")

            if cache_type in ["all", "metrics"]:
                if remote:
@@ -163,13 +165,13 @@ async def construct_remote_url(remote_name: str, path: str) -> str:


 async def check_artifact_patterns(remote_name: str, repo_path: str, file_path: str, full_path: str) -> bool:
-    # First check if this is an index file - always allow index files
-    index_patterns = config.get_index_patterns(remote_name)
-    if cache.is_index_file(file_path, index_patterns) or cache.is_index_file(full_path, index_patterns):
+    # Mutable files (index files) are always allowed through
+    mutable_patterns = config.get_mutable_patterns(remote_name)
+    if cache.is_mutable_file(file_path, mutable_patterns) or cache.is_mutable_file(full_path, mutable_patterns):
        return True

-    # Then check basic include patterns
-    patterns = config.get_repository_patterns(remote_name, repo_path)
+    # Check immutable include patterns
+    patterns = config.get_immutable_patterns(remote_name, repo_path)
    if not patterns:
        return True  # Allow all if no patterns configured

@@ -183,7 +185,6 @@ async def check_artifact_patterns(remote_name: str, repo_path: str, file_path: s
    if not pattern_matched:
        return False

-    # All remotes now use pattern-based filtering only - no additional checks needed
    return True


@@ -241,12 +242,36 @@ async def cache_single_artifact(url: str, remote_name: str, path: str) -> dict:
                "storage_path": storage_path,
                "size": len(response.content),
                "status": "cached",
+                "etag": response.headers.get("ETag"),
+                "last_modified": response.headers.get("Last-Modified"),
            }

    except Exception as e:
        return {"url": url, "status": "error", "error": str(e)}


+async def check_upstream_changed(remote_url: str, remote_name: str, path: str) -> bool:
+    """Conditional HEAD against upstream. Returns False only on a definitive 304."""
+    meta = cache.get_mutable_meta(remote_name, path)
+    if not meta:
+        return True
+
+    headers = {}
+    if meta.get("etag"):
+        headers["If-None-Match"] = meta["etag"]
+    if meta.get("last_modified"):
+        headers["If-Modified-Since"] = meta["last_modified"]
+    if not headers:
+        return True
+
+    try:
+        async with httpx.AsyncClient(follow_redirects=True) as client:
+            response = await client.head(remote_url, headers=headers)
+        return response.status_code != 304
+    except Exception:
+        return True
+
+
@app.get("/api/v1/remote/{remote_name}/{path:path}")
 async def get_artifact(remote_name: str, path: str):
    # Check if remote is configured
@@ -297,17 +322,29 @@ async def get_artifact(remote_name: str, path: str):
    if not storage.exists(cached_key):
        cached_key = None

-    # For index files, check Redis TTL validity
+    # For mutable files, check Redis TTL validity
    filename = os.path.basename(path)
-    is_index = cache.is_index_file(path, config.get_index_patterns(remote_name))
+    is_mutable = cache.is_mutable_file(path, config.get_mutable_patterns(remote_name))

-    if cached_key and is_index:
-        # Index file exists, but check if it's still valid
+    if cached_key and is_mutable:
        if not cache.is_index_valid(remote_name, path):
-            # Index has expired, remove it from S3
-            logger.info(f"Index EXPIRED: {remote_name}/{path} - removing from cache")
-            cache.cleanup_expired_index(storage, remote_name, path)
-            cached_key = None  # Force re-download
+            remote_cfg = config.get_remote_config(remote_name) or {}
+            check_updates = remote_cfg.get("check_mutable_updates", False)
+            user_mutable = check_updates and cache.is_mutable_file(path, config.get_user_mutable_patterns(remote_name))
+            if user_mutable:
+                changed = await check_upstream_changed(remote_url, remote_name, path)
+                if not changed:
+                    mutable_ttl = config.get_cache_config(remote_name).get("mutable_ttl", 3600)
+                    cache.mark_index_cached(remote_name, path, mutable_ttl)
+                    logger.info(f"Mutable file UNCHANGED: {remote_name}/{path} - TTL refreshed ({mutable_ttl}s)")
+                else:
+                    logger.info(f"Mutable file CHANGED: {remote_name}/{path} - re-downloading")
+                    cache.cleanup_expired_index(storage, remote_name, path)
+                    cached_key = None
+            else:
+                logger.info(f"Mutable file EXPIRED: {remote_name}/{path} - removing from cache")
+                cache.cleanup_expired_index(storage, remote_name, path)
+                cached_key = None

    if cached_key:
        # Return cached artifact
@@ -359,13 +396,14 @@ async def get_artifact(remote_name: str, path: str):
        logger.error(f"Cache ADD FAILED: {remote_name}/{path} - {result['error']}")
        raise HTTPException(status_code=502, detail=f"Failed to fetch artifact: {result['error']}")

-    # Mark index files as cached in Redis if this was a new download
-    if result["status"] == "cached" and is_index:
-        # Get TTL from remote config
+    # Mark mutable files as cached in Redis with TTL
+    if result["status"] == "cached" and is_mutable:
        cache_config = config.get_cache_config(remote_name)
-        index_ttl = cache_config.get("index_ttl", 300)  # Default 5 minutes
-        cache.mark_index_cached(remote_name, path, index_ttl)
-        logger.info(f"Index file cached with TTL: {remote_name}/{path} (ttl: {index_ttl}s)")
+        mutable_ttl = cache_config.get("mutable_ttl", 3600)
+        cache.mark_index_cached(remote_name, path, mutable_ttl)
+        logger.info(f"Mutable file cached with TTL: {remote_name}/{path} (ttl: {mutable_ttl}s)")
+        if result.get("etag") or result.get("last_modified"):
+            cache.store_mutable_meta(remote_name, path, result.get("etag"), result.get("last_modified"))

    # Now return the cached artifact
    try:
@@ -424,8 +462,8 @@ async def docker_v2_proxy(request: Request, remote_name: str, path: str):
    if remote_config.get("package") != "docker":
        raise HTTPException(status_code=400, detail=f"Remote '{remote_name}' is not a docker remote")

-    # Check include_patterns against the image name (e.g. "library/nginx")
-    patterns = config.get_repository_patterns(remote_name, "")
+    # Check immutable_patterns against the image name (e.g. "library/nginx")
+    patterns = config.get_immutable_patterns(remote_name, "")
    if patterns:
        path_parts = path.split("/")
        image_name = "/".join(path_parts[:2]) if len(path_parts) >= 2 else path
@@ -439,24 +477,40 @@ async def docker_v2_proxy(request: Request, remote_name: str, path: str):
    if not storage.exists(cached_key):
        cached_key = None

-    is_index = cache.is_index_file(path, config.get_index_patterns(remote_name))
+    is_mutable = cache.is_mutable_file(path, config.get_mutable_patterns(remote_name))

-    if cached_key and is_index:
+    if cached_key and is_mutable:
        if not cache.is_index_valid(remote_name, path):
-            logger.info(f"Index EXPIRED: {remote_name}/{path} - removing from cache")
-            cache.cleanup_expired_index(storage, remote_name, path)
-            cached_key = None
+            remote_cfg = config.get_remote_config(remote_name) or {}
+            check_updates = remote_cfg.get("check_mutable_updates", False)
+            user_mutable = check_updates and cache.is_mutable_file(path, config.get_user_mutable_patterns(remote_name))
+            if user_mutable:
+                changed = await check_upstream_changed(remote_url, remote_name, path)
+                if not changed:
+                    mutable_ttl = config.get_cache_config(remote_name).get("mutable_ttl", 3600)
+                    cache.mark_index_cached(remote_name, path, mutable_ttl)
+                    logger.info(f"Mutable file UNCHANGED: {remote_name}/{path} - TTL refreshed ({mutable_ttl}s)")
+                else:
+                    logger.info(f"Mutable file CHANGED: {remote_name}/{path} - re-downloading")
+                    cache.cleanup_expired_index(storage, remote_name, path)
+                    cached_key = None
+            else:
+                logger.info(f"Mutable file EXPIRED: {remote_name}/{path} - removing from cache")
+                cache.cleanup_expired_index(storage, remote_name, path)
+                cached_key = None

    if not cached_key:
        logger.info(f"Cache MISS: {remote_name}/{path} - fetching from remote: {remote_url}")
        result = await cache_single_artifact(remote_url, remote_name, path)
        if result["status"] == "error":
            raise HTTPException(status_code=502, detail=f"Failed to fetch: {result['error']}")
-        if result["status"] == "cached" and is_index:
+        if result["status"] == "cached" and is_mutable:
            cache_config = config.get_cache_config(remote_name)
-            index_ttl = cache_config.get("index_ttl", 300)
-            cache.mark_index_cached(remote_name, path, index_ttl)
-            logger.info(f"Index file cached with TTL: {remote_name}/{path} (ttl: {index_ttl}s)")
+            mutable_ttl = cache_config.get("mutable_ttl", 3600)
+            cache.mark_index_cached(remote_name, path, mutable_ttl)
+            logger.info(f"Mutable file cached with TTL: {remote_name}/{path} (ttl: {mutable_ttl}s)")
+            if result.get("etag") or result.get("last_modified"):
+                cache.store_mutable_meta(remote_name, path, result.get("etag"), result.get("last_modified"))

    artifact_data = storage.download_object(storage.get_object_key(remote_name, path))

@@ -22,47 +22,55 @@ TEST_REMOTES = {
            "base_url": "https://dl-cdn.alpinelinux.org",
            "type": "remote",
            "package": "alpine",
-            "include_patterns": [".*/x86_64/.*\\.apk$"],
-            "cache": {"file_ttl": 0, "index_ttl": 3600},
+            "immutable_patterns": [".*/x86_64/.*\\.apk$"],
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 3600},
        },
        "rpm-test": {
            "base_url": "https://example.com/rpm",
            "type": "remote",
            "package": "rpm",
-            "include_patterns": [".*/x86_64/.*\\.rpm$", ".*/repodata/.*$"],
-            "cache": {"file_ttl": 0, "index_ttl": 3600},
+            "immutable_patterns": [".*/x86_64/.*\\.rpm$", ".*/repodata/.*$"],
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 3600},
        },
        "docker-test": {
            "base_url": "https://registry.example.com",
            "type": "remote",
            "package": "docker",
-            "cache": {"file_ttl": 0, "index_ttl": 300},
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 300},
        },
        "docker-restricted": {
            "base_url": "https://registry.example.com",
            "type": "remote",
            "package": "docker",
-            "include_patterns": ["^library/nginx"],
-            "cache": {"file_ttl": 0, "index_ttl": 300},
+            "immutable_patterns": ["^library/nginx"],
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 300},
        },
        "generic-test": {
            "base_url": "https://releases.example.com",
            "type": "remote",
            "package": "generic",
-            "include_patterns": [".*\\.tar\\.gz$"],
-            "cache": {"file_ttl": 0, "index_ttl": 0},
+            "immutable_patterns": [".*\\.tar\\.gz$"],
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 0},
        },
        "custom-index-test": {
            "base_url": "https://example.com",
            "type": "remote",
            "package": "generic",
-            "index_patterns": ["metadata\\.json$"],
-            "cache": {"file_ttl": 0, "index_ttl": 600},
+            "mutable_patterns": ["metadata\\.json$"],
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 600},
+        },
+        "check-mutable-test": {
+            "base_url": "https://example.com",
+            "type": "remote",
+            "package": "generic",
+            "mutable_patterns": ["metadata\\.json$"],
+            "check_mutable_updates": True,
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 600},
        },
        "local-test": {
            "type": "local",
            "package": "generic",
-            "cache": {"file_ttl": 0, "index_ttl": 0},
+            "cache": {"immutable_ttl": 0, "mutable_ttl": 0},
        },
    }
 }
@@ -1,4 +1,4 @@
-"""Tests for RedisCache, focusing on is_index_file with configurable patterns."""
+"""Tests for RedisCache, focusing on is_mutable_file with configurable patterns."""

 import hashlib
 from unittest.mock import ANY, MagicMock, patch
@@ -6,7 +6,7 @@ from unittest.mock import ANY, MagicMock, patch
 import pytest

 from artifactapi.cache import RedisCache
-from artifactapi.config import _PACKAGE_INDEX_PATTERNS
+from artifactapi.config import _PACKAGE_MUTABLE_PATTERNS


@pytest.fixture
@@ -38,139 +38,139 @@ def cache_with_redis(mock_redis_client):


 # ---------------------------------------------------------------------------
-# is_index_file — alpine patterns
+# is_mutable_file — alpine patterns
 # ---------------------------------------------------------------------------


-class TestIsIndexFileAlpine:
+class TestIsMutableFileAlpine:
    def test_apkindex_tarball_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["alpine"]
-        assert bare_cache.is_index_file("alpine/v3.18/x86_64/APKINDEX.tar.gz", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["alpine"]
+        assert bare_cache.is_mutable_file("alpine/v3.18/x86_64/APKINDEX.tar.gz", patterns)

    def test_nested_apkindex_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["alpine"]
-        assert bare_cache.is_index_file("mirrors/dl-cdn/alpine/v3.19/community/x86_64/APKINDEX.tar.gz", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["alpine"]
+        assert bare_cache.is_mutable_file("mirrors/dl-cdn/alpine/v3.19/community/x86_64/APKINDEX.tar.gz", patterns)

    def test_apk_package_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["alpine"]
-        assert not bare_cache.is_index_file("alpine/v3.18/x86_64/musl-1.2.4-r2.apk", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["alpine"]
+        assert not bare_cache.is_mutable_file("alpine/v3.18/x86_64/musl-1.2.4-r2.apk", patterns)

    def test_random_tarball_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["alpine"]
-        assert not bare_cache.is_index_file("some/path/archive.tar.gz", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["alpine"]
+        assert not bare_cache.is_mutable_file("some/path/archive.tar.gz", patterns)

    def test_apkindex_signature_file_is_not_index(self, bare_cache):
        # Signature file adjacent to the index should not be treated as an index
-        patterns = _PACKAGE_INDEX_PATTERNS["alpine"]
-        assert not bare_cache.is_index_file("alpine/v3.18/x86_64/APKINDEX.tar.gz.sig", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["alpine"]
+        assert not bare_cache.is_mutable_file("alpine/v3.18/x86_64/APKINDEX.tar.gz.sig", patterns)

    def test_apkindex_tmp_file_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["alpine"]
-        assert not bare_cache.is_index_file("alpine/v3.18/x86_64/APKINDEX.tar.gz.tmp", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["alpine"]
+        assert not bare_cache.is_mutable_file("alpine/v3.18/x86_64/APKINDEX.tar.gz.tmp", patterns)


 # ---------------------------------------------------------------------------
-# is_index_file — rpm patterns
+# is_mutable_file — rpm patterns
 # ---------------------------------------------------------------------------


-class TestIsIndexFileRpm:
+class TestIsMutableFileRpm:
    def test_repomd_xml_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert bare_cache.is_index_file("almalinux/9/x86_64/repomd.xml", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert bare_cache.is_mutable_file("almalinux/9/x86_64/repomd.xml", patterns)

    def test_repodata_primary_xml_gz_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert bare_cache.is_index_file("repo/repodata/primary.xml.gz", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert bare_cache.is_mutable_file("repo/repodata/primary.xml.gz", patterns)

    def test_repodata_sqlite_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert bare_cache.is_index_file("repo/repodata/primary.sqlite", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert bare_cache.is_mutable_file("repo/repodata/primary.sqlite", patterns)

    def test_repodata_sqlite_bz2_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert bare_cache.is_index_file("repo/repodata/other.sqlite.bz2", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert bare_cache.is_mutable_file("repo/repodata/other.sqlite.bz2", patterns)

    def test_repodata_yaml_xz_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert bare_cache.is_index_file("repo/repodata/comps.yaml.xz", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert bare_cache.is_mutable_file("repo/repodata/comps.yaml.xz", patterns)

    def test_packages_gz_pattern_matches_any_path(self, bare_cache):
        # The Packages.gz$ regex is a carryover from the original hardcoded logic and
        # deliberately matches any path ending in Packages.gz — including Debian-style paths.
        # This test documents that intentional behaviour.
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert bare_cache.is_index_file("debian/dists/stable/main/binary-amd64/Packages.gz", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert bare_cache.is_mutable_file("debian/dists/stable/main/binary-amd64/Packages.gz", patterns)

    def test_rpm_package_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert not bare_cache.is_index_file("almalinux/9/x86_64/Packages/bash-5.1.8.x86_64.rpm", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert not bare_cache.is_mutable_file("almalinux/9/x86_64/Packages/bash-5.1.8.x86_64.rpm", patterns)

    def test_arbitrary_xml_outside_repodata_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["rpm"]
-        assert not bare_cache.is_index_file("some/path/config.xml", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["rpm"]
+        assert not bare_cache.is_mutable_file("some/path/config.xml", patterns)


 # ---------------------------------------------------------------------------
-# is_index_file — docker patterns
+# is_mutable_file — docker patterns
 # ---------------------------------------------------------------------------


-class TestIsIndexFileDocker:
+class TestIsMutableFileDocker:
    def test_tag_manifest_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
-        assert bare_cache.is_index_file("library/nginx/manifests/latest", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
+        assert bare_cache.is_mutable_file("library/nginx/manifests/latest", patterns)

    def test_version_tag_manifest_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
-        assert bare_cache.is_index_file("library/nginx/manifests/1.25.3", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
+        assert bare_cache.is_mutable_file("library/nginx/manifests/1.25.3", patterns)

    def test_hyphenated_tag_manifest_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
-        assert bare_cache.is_index_file("library/nginx/manifests/latest-rc", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
+        assert bare_cache.is_mutable_file("library/nginx/manifests/latest-rc", patterns)

    def test_numeric_date_tag_manifest_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
-        assert bare_cache.is_index_file("library/nginx/manifests/20240101", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
+        assert bare_cache.is_mutable_file("library/nginx/manifests/20240101", patterns)

    def test_digest_manifest_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
        digest = "sha256:" + "a" * 64
-        assert not bare_cache.is_index_file(f"library/nginx/manifests/{digest}", patterns)
+        assert not bare_cache.is_mutable_file(f"library/nginx/manifests/{digest}", patterns)

    def test_tags_list_is_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
-        assert bare_cache.is_index_file("library/nginx/tags/list", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
+        assert bare_cache.is_mutable_file("library/nginx/tags/list", patterns)

    def test_blob_is_not_index(self, bare_cache):
-        patterns = _PACKAGE_INDEX_PATTERNS["docker"]
-        assert not bare_cache.is_index_file("library/nginx/blobs/sha256:abc123", patterns)
+        patterns = _PACKAGE_MUTABLE_PATTERNS["docker"]
+        assert not bare_cache.is_mutable_file("library/nginx/blobs/sha256:abc123", patterns)


 # ---------------------------------------------------------------------------
-# is_index_file — edge cases
+# is_mutable_file — edge cases
 # ---------------------------------------------------------------------------


-class TestIsIndexFileEdgeCases:
+class TestIsMutableFileEdgeCases:
    def test_empty_patterns_nothing_is_index(self, bare_cache):
-        assert not bare_cache.is_index_file("APKINDEX.tar.gz", [])
-        assert not bare_cache.is_index_file("repomd.xml", [])
-        assert not bare_cache.is_index_file("library/nginx/manifests/latest", [])
+        assert not bare_cache.is_mutable_file("APKINDEX.tar.gz", [])
+        assert not bare_cache.is_mutable_file("repomd.xml", [])
+        assert not bare_cache.is_mutable_file("library/nginx/manifests/latest", [])

    def test_none_patterns_nothing_is_index(self, bare_cache):
-        assert not bare_cache.is_index_file("APKINDEX.tar.gz", None)
-        assert not bare_cache.is_index_file("repomd.xml", None)
+        assert not bare_cache.is_mutable_file("APKINDEX.tar.gz", None)
+        assert not bare_cache.is_mutable_file("repomd.xml", None)

    def test_custom_patterns_match(self, bare_cache):
        patterns = [r"metadata\.json$", r"index\.yaml$"]
-        assert bare_cache.is_index_file("repo/metadata.json", patterns)
-        assert bare_cache.is_index_file("repo/subdir/index.yaml", patterns)
-        assert not bare_cache.is_index_file("repo/data.tar.gz", patterns)
+        assert bare_cache.is_mutable_file("repo/metadata.json", patterns)
+        assert bare_cache.is_mutable_file("repo/subdir/index.yaml", patterns)
+        assert not bare_cache.is_mutable_file("repo/data.tar.gz", patterns)

    def test_custom_pattern_does_not_match_standard_index(self, bare_cache):
        patterns = [r"metadata\.json$"]
-        assert not bare_cache.is_index_file("APKINDEX.tar.gz", patterns)
+        assert not bare_cache.is_mutable_file("APKINDEX.tar.gz", patterns)


 # ---------------------------------------------------------------------------
@@ -235,3 +235,51 @@ class TestIndexValidity:
        # client is None when Redis is unavailable — setex cannot be called
        assert unavailable_cache.client is None
        unavailable_cache.mark_index_cached("remote", "some/path", 300)  # must not raise
+
+
+# ---------------------------------------------------------------------------
+# mutable meta (ETag / Last-Modified storage)
+# ---------------------------------------------------------------------------
+
+
+class TestMutableMeta:
+    def test_meta_key_format(self, bare_cache):
+        path = "repo/metadata.json"
+        expected_hash = hashlib.sha256(path.encode()).hexdigest()[:16]
+        assert bare_cache.get_mutable_meta_key("myremote", path) == f"mutable:meta:myremote:{expected_hash}"
+
+    def test_meta_key_hash_is_16_chars(self, bare_cache):
+        key = bare_cache.get_mutable_meta_key("remote", "some/path/file.json")
+        assert len(key.split(":")[-1]) == 16
+
+    def test_store_and_retrieve_etag(self, cache_with_redis, mock_redis_client):
+        mock_redis_client.hgetall.return_value = {"etag": '"abc123"'}
+        cache_with_redis.store_mutable_meta("remote", "path/meta.json", '"abc123"', None)
+        mock_redis_client.hset.assert_called_once()
+        meta = cache_with_redis.get_mutable_meta("remote", "path/meta.json")
+        assert meta["etag"] == '"abc123"'
+
+    def test_store_and_retrieve_last_modified(self, cache_with_redis, mock_redis_client):
+        lm = "Mon, 01 Jan 2024 00:00:00 GMT"
+        mock_redis_client.hgetall.return_value = {"last_modified": lm}
+        cache_with_redis.store_mutable_meta("remote", "path/meta.json", None, lm)
+        meta = cache_with_redis.get_mutable_meta("remote", "path/meta.json")
+        assert meta["last_modified"] == lm
+
+    def test_store_no_op_when_both_none(self, cache_with_redis, mock_redis_client):
+        cache_with_redis.store_mutable_meta("remote", "path/meta.json", None, None)
+        mock_redis_client.hset.assert_not_called()
+
+    def test_store_no_op_when_unavailable(self, unavailable_cache):
+        unavailable_cache.store_mutable_meta("remote", "path", "etag", None)  # must not raise
+
+    def test_get_returns_empty_when_unavailable(self, unavailable_cache):
+        assert unavailable_cache.get_mutable_meta("remote", "path") == {}
+
+    def test_delete_removes_meta_key(self, cache_with_redis, mock_redis_client):
+        expected_key = cache_with_redis.get_mutable_meta_key("remote", "path/meta.json")
+        cache_with_redis.delete_mutable_meta("remote", "path/meta.json")
+        mock_redis_client.delete.assert_called_once_with(expected_key)
+
+    def test_delete_no_op_when_unavailable(self, unavailable_cache):
+        unavailable_cache.delete_mutable_meta("remote", "path")  # must not raise
@@ -1,4 +1,4 @@
-"""Tests for ConfigManager, focusing on get_index_patterns (new logic)."""
+"""Tests for ConfigManager, focusing on get_mutable_patterns and get_immutable_patterns."""

 import os

@@ -21,45 +21,44 @@ def make_config(tmp_path):


 # ---------------------------------------------------------------------------
-# get_index_patterns
+# get_mutable_patterns
 # ---------------------------------------------------------------------------


-class TestGetIndexPatterns:
+class TestGetMutablePatterns:
    def test_alpine_returns_package_defaults(self, make_config):
        cfg = make_config({"r": {"type": "remote", "package": "alpine", "base_url": "https://x.com"}})
-        patterns = cfg.get_index_patterns("r")
-        # Assert against literal strings, not the live constant, so a rename doesn't mask a regression
+        patterns = cfg.get_mutable_patterns("r")
        assert r"APKINDEX\.tar\.gz$" in patterns

    def test_rpm_returns_package_defaults(self, make_config):
        cfg = make_config({"r": {"type": "remote", "package": "rpm", "base_url": "https://x.com"}})
-        patterns = cfg.get_index_patterns("r")
+        patterns = cfg.get_mutable_patterns("r")
        assert r"repomd\.xml$" in patterns
        assert any("repodata" in p for p in patterns)

    def test_docker_returns_package_defaults(self, make_config):
        cfg = make_config({"r": {"type": "remote", "package": "docker", "base_url": "https://x.com"}})
-        patterns = cfg.get_index_patterns("r")
+        patterns = cfg.get_mutable_patterns("r")
        assert any("manifests" in p for p in patterns)
        assert any("tags/list" in p for p in patterns)

    def test_generic_returns_empty_list(self, make_config):
        cfg = make_config({"r": {"type": "remote", "package": "generic", "base_url": "https://x.com"}})
-        assert cfg.get_index_patterns("r") == []
+        assert cfg.get_mutable_patterns("r") == []

    def test_unknown_remote_returns_empty_list(self, make_config):
        cfg = make_config({})
-        assert cfg.get_index_patterns("nonexistent") == []
+        assert cfg.get_mutable_patterns("nonexistent") == []

    def test_missing_package_field_defaults_to_generic(self, make_config):
        cfg = make_config({"r": {"type": "remote", "base_url": "https://x.com"}})
-        assert cfg.get_index_patterns("r") == []
+        assert cfg.get_mutable_patterns("r") == []

    def test_unknown_package_type_returns_empty_list(self, make_config):
        # A mis-spelled package type silently returns [] — this is a known footgun
        cfg = make_config({"r": {"type": "remote", "package": "deb", "base_url": "https://x.com"}})
-        assert cfg.get_index_patterns("r") == []
+        assert cfg.get_mutable_patterns("r") == []

    def test_extra_patterns_appended_after_defaults(self, make_config):
        cfg = make_config(
@@ -68,11 +67,11 @@ class TestGetIndexPatterns:
                    "type": "remote",
                    "package": "alpine",
                    "base_url": "https://x.com",
-                    "index_patterns": [r"custom\.json$"],
+                    "mutable_patterns": [r"custom\.json$"],
                }
            }
        )
-        patterns = cfg.get_index_patterns("r")
+        patterns = cfg.get_mutable_patterns("r")
        assert r"APKINDEX\.tar\.gz$" in patterns
        assert r"custom\.json$" in patterns
        # Defaults come first
@@ -85,11 +84,11 @@ class TestGetIndexPatterns:
                    "type": "remote",
                    "package": "alpine",
                    "base_url": "https://x.com",
-                    "index_patterns": [],
+                    "mutable_patterns": [],
                }
            }
        )
-        assert r"APKINDEX\.tar\.gz$" in cfg.get_index_patterns("r")
+        assert r"APKINDEX\.tar\.gz$" in cfg.get_mutable_patterns("r")

    def test_duplicate_extra_pattern_not_added_twice(self, make_config):
        existing = r"APKINDEX\.tar\.gz$"
@@ -99,11 +98,11 @@ class TestGetIndexPatterns:
                    "type": "remote",
                    "package": "alpine",
                    "base_url": "https://x.com",
-                    "index_patterns": [existing],
+                    "mutable_patterns": [existing],
                }
            }
        )
-        patterns = cfg.get_index_patterns("r")
+        patterns = cfg.get_mutable_patterns("r")
        assert patterns.count(existing) == 1

    def test_generic_with_only_extra_patterns(self, make_config):
@@ -113,11 +112,11 @@ class TestGetIndexPatterns:
                    "type": "remote",
                    "package": "generic",
                    "base_url": "https://x.com",
-                    "index_patterns": [r"meta\.json$", r"index\.yaml$"],
+                    "mutable_patterns": [r"meta\.json$", r"index\.yaml$"],
                }
            }
        )
-        assert cfg.get_index_patterns("r") == [r"meta\.json$", r"index\.yaml$"]
+        assert cfg.get_mutable_patterns("r") == [r"meta\.json$", r"index\.yaml$"]

    def test_rpm_extra_patterns_merged(self, make_config):
        cfg = make_config(
@@ -126,41 +125,41 @@ class TestGetIndexPatterns:
                    "type": "remote",
                    "package": "rpm",
                    "base_url": "https://x.com",
-                    "index_patterns": [r"custom-meta\.xml$"],
+                    "mutable_patterns": [r"custom-meta\.xml$"],
                }
            }
        )
-        patterns = cfg.get_index_patterns("r")
+        patterns = cfg.get_mutable_patterns("r")
        assert r"repomd\.xml$" in patterns
        assert r"custom-meta\.xml$" in patterns


 # ---------------------------------------------------------------------------
-# get_repository_patterns
+# get_immutable_patterns
 # ---------------------------------------------------------------------------


-class TestGetRepositoryPatterns:
-    def test_returns_include_patterns(self, make_config):
+class TestGetImmutablePatterns:
+    def test_returns_immutable_patterns(self, make_config):
        cfg = make_config(
            {
                "r": {
                    "type": "remote",
                    "package": "generic",
                    "base_url": "https://x.com",
-                    "include_patterns": [r".*\.tar\.gz$"],
+                    "immutable_patterns": [r".*\.tar\.gz$"],
                }
            }
        )
-        assert cfg.get_repository_patterns("r", "") == [r".*\.tar\.gz$"]
+        assert cfg.get_immutable_patterns("r") == [r".*\.tar\.gz$"]

    def test_returns_empty_for_missing_remote(self, make_config):
        cfg = make_config({})
-        assert cfg.get_repository_patterns("nonexistent", "") == []
+        assert cfg.get_immutable_patterns("nonexistent") == []

    def test_returns_empty_when_no_patterns_configured(self, make_config):
        cfg = make_config({"r": {"type": "remote", "package": "generic", "base_url": "https://x.com"}})
-        assert cfg.get_repository_patterns("r", "") == []
+        assert cfg.get_immutable_patterns("r") == []

    def test_multiple_patterns_returned(self, make_config):
        patterns = [r".*\.rpm$", r".*/repodata/.*$"]
@@ -170,11 +169,11 @@ class TestGetRepositoryPatterns:
                    "type": "remote",
                    "package": "rpm",
                    "base_url": "https://x.com",
-                    "include_patterns": patterns,
+                    "immutable_patterns": patterns,
                }
            }
        )
-        assert cfg.get_repository_patterns("r", "") == patterns
+        assert cfg.get_immutable_patterns("r") == patterns

    def test_dict_keyed_repositories_returns_per_repo_patterns(self, make_config):
        cfg = make_config(
@@ -183,14 +182,14 @@ class TestGetRepositoryPatterns:
                    "type": "remote",
                    "package": "generic",
                    "base_url": "https://x.com",
-                    "include_patterns": [r".*\.tar\.gz$"],
+                    "immutable_patterns": [r".*\.tar\.gz$"],
                    "repositories": {
-                        "/path/to/repo": {"include_patterns": [r".*\.rpm$"]},
+                        "/path/to/repo": {"immutable_patterns": [r".*\.rpm$"]},
                    },
                }
            }
        )
-        assert cfg.get_repository_patterns("r", "/path/to/repo") == [r".*\.rpm$"]
+        assert cfg.get_immutable_patterns("r", "/path/to/repo") == [r".*\.rpm$"]

    def test_dict_keyed_repositories_falls_back_to_remote_patterns(self, make_config):
        cfg = make_config(
@@ -199,14 +198,47 @@ class TestGetRepositoryPatterns:
                    "type": "remote",
                    "package": "generic",
                    "base_url": "https://x.com",
-                    "include_patterns": [r".*\.tar\.gz$"],
+                    "immutable_patterns": [r".*\.tar\.gz$"],
                    "repositories": {
-                        "/path/to/repo": {"include_patterns": [r".*\.rpm$"]},
+                        "/path/to/repo": {"immutable_patterns": [r".*\.rpm$"]},
                    },
                }
            }
        )
-        assert cfg.get_repository_patterns("r", "/unknown/path") == [r".*\.tar\.gz$"]
+        assert cfg.get_immutable_patterns("r", "/unknown/path") == [r".*\.tar\.gz$"]
+
+
+# ---------------------------------------------------------------------------
+# get_user_mutable_patterns
+# ---------------------------------------------------------------------------
+
+
+class TestGetUserMutablePatterns:
+    def test_returns_only_user_patterns(self, make_config):
+        cfg = make_config(
+            {
+                "r": {
+                    "type": "remote",
+                    "package": "alpine",
+                    "base_url": "https://x.com",
+                    "mutable_patterns": [r"custom\.json$"],
+                }
+            }
+        )
+        assert cfg.get_user_mutable_patterns("r") == [r"custom\.json$"]
+
+    def test_excludes_package_defaults(self, make_config):
+        # Package defaults (APKINDEX etc.) must NOT appear here
+        cfg = make_config({"r": {"type": "remote", "package": "alpine", "base_url": "https://x.com"}})
+        assert cfg.get_user_mutable_patterns("r") == []
+
+    def test_returns_empty_for_missing_remote(self, make_config):
+        cfg = make_config({})
+        assert cfg.get_user_mutable_patterns("nonexistent") == []
+
+    def test_returns_empty_when_key_absent(self, make_config):
+        cfg = make_config({"r": {"type": "remote", "package": "generic", "base_url": "https://x.com"}})
+        assert cfg.get_user_mutable_patterns("r") == []


 # ---------------------------------------------------------------------------
@@ -222,11 +254,11 @@ class TestGetCacheConfig:
                    "type": "remote",
                    "package": "generic",
                    "base_url": "https://x.com",
-                    "cache": {"file_ttl": 0, "index_ttl": 7200},
+                    "cache": {"immutable_ttl": 0, "mutable_ttl": 7200},
                }
            }
        )
-        assert cfg.get_cache_config("r") == {"file_ttl": 0, "index_ttl": 7200}
+        assert cfg.get_cache_config("r") == {"immutable_ttl": 0, "mutable_ttl": 7200}

    def test_returns_empty_dict_for_missing_remote(self, make_config):
        cfg = make_config({})
@@ -25,7 +25,7 @@ def mock_storage():
@pytest.fixture
 def mock_cache():
    m = MagicMock()
-    m.is_index_file.return_value = False
+    m.is_mutable_file.return_value = False
    m.is_index_valid.return_value = True
    m.available = False
    m.client = None
@@ -123,7 +123,7 @@ class TestDockerProxy:
        ).encode()
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True
        deps["cache"].is_index_valid.return_value = True

        response = client.get("/v2/docker-restricted/library/nginx/manifests/latest")
@@ -140,7 +140,7 @@ class TestDockerProxy:
        ).encode()
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True
        deps["cache"].is_index_valid.return_value = True

        response = client.get("/v2/docker-test/library/nginx/manifests/latest")
@@ -158,7 +158,7 @@ class TestDockerProxy:
        ).encode()
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True
        deps["cache"].is_index_valid.return_value = True

        response = client.get("/v2/docker-test/library/nginx/manifests/latest")
@@ -170,7 +170,7 @@ class TestDockerProxy:
        manifest = json.dumps({"mediaType": "application/vnd.oci.image.manifest.v1+json", "layers": []}).encode()
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        client.get("/v2/docker-test/library/nginx/manifests/latest")
        deps["metrics"].record_cache_hit.assert_called_once_with("docker-test", ANY)
@@ -185,7 +185,7 @@ class TestDockerProxy:
        ).encode()
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        response = client.head("/v2/docker-test/library/nginx/manifests/latest")
        assert response.status_code == 200
@@ -201,7 +201,7 @@ class TestDockerProxy:
        ).encode()
        deps["storage"].exists.return_value = False
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True

        with patch(
            "artifactapi.main.cache_single_artifact",
@@ -223,7 +223,7 @@ class TestDockerProxy:
        ).encode()
        deps["storage"].exists.return_value = False
        deps["storage"].download_object.return_value = manifest
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True

        with patch(
            "artifactapi.main.cache_single_artifact",
@@ -244,7 +244,7 @@ class TestDockerProxy:
            }
        ).encode()
        deps["storage"].exists.return_value = True  # cached in S3
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True
        deps["cache"].is_index_valid.return_value = False  # but TTL expired
        deps["storage"].download_object.return_value = manifest

@@ -278,7 +278,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"tar content"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        response = client.get("/api/v1/remote/generic-test/some/path/archive.tar.gz")
        assert response.status_code == 200
@@ -289,7 +289,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"content"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        response = client.get("/api/v1/remote/generic-test/some/path/archive.tar.gz")
        disposition = response.headers["content-disposition"]
@@ -301,7 +301,7 @@ class TestGenericArtifactRoute:
        content = b"some artifact content bytes"
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = content
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        response = client.get("/api/v1/remote/generic-test/some/path/archive.tar.gz")
        assert response.headers["X-Artifact-Size"] == str(len(content))
@@ -310,7 +310,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"content"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        client.get("/api/v1/remote/generic-test/some/path/archive.tar.gz")
        deps["metrics"].record_cache_hit.assert_called_once_with("generic-test", ANY)
@@ -319,7 +319,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"content"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        client.get("/api/v1/remote/generic-test/some/path/archive.tar.gz")
        deps["database"].record_artifact_mapping.assert_called_once()
@@ -328,7 +328,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"rpm bytes"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        response = client.get("/api/v1/remote/rpm-test/almalinux/9/x86_64/bash-5.1.8.x86_64.rpm")
        assert response.status_code == 200
@@ -338,7 +338,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"<?xml version='1.0'?>"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        response = client.get("/api/v1/remote/rpm-test/repo/repodata/primary.xml")
        assert response.status_code == 200
@@ -348,7 +348,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = False
        deps["storage"].download_object.return_value = b"fresh content"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        with patch(
            "artifactapi.main.cache_single_artifact",
@@ -365,7 +365,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = False
        deps["storage"].download_object.return_value = b"fresh content"
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        with patch(
            "artifactapi.main.cache_single_artifact",
@@ -380,7 +380,7 @@ class TestGenericArtifactRoute:
        deps = patched_deps
        deps["storage"].exists.return_value = False
        deps["storage"].download_object.return_value = b"APKINDEX content"
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True

        with patch(
            "artifactapi.main.cache_single_artifact",
@@ -395,7 +395,7 @@ class TestGenericArtifactRoute:
    def test_upstream_error_returns_502(self, client, patched_deps):
        deps = patched_deps
        deps["storage"].exists.return_value = False
-        deps["cache"].is_index_file.return_value = False
+        deps["cache"].is_mutable_file.return_value = False

        with patch(
            "artifactapi.main.cache_single_artifact",
@@ -406,19 +406,66 @@ class TestGenericArtifactRoute:

        assert response.status_code == 502

-    def test_index_file_bypasses_include_patterns(self, client, patched_deps):
-        """Index files must be served even when they don't match include_patterns."""
+    def test_mutable_file_bypasses_immutable_patterns(self, client, patched_deps):
+        """Mutable files must be served even when they don't match immutable_patterns."""
        deps = patched_deps
        deps["storage"].exists.return_value = True
        deps["storage"].download_object.return_value = b"APKINDEX content"
-        deps["cache"].is_index_file.return_value = True
+        deps["cache"].is_mutable_file.return_value = True
        deps["cache"].is_index_valid.return_value = True

-        # APKINDEX.tar.gz does not match alpine-test's include_patterns (.*.apk$),
-        # but since is_index_file returns True it must be allowed through.
+        # APKINDEX.tar.gz does not match alpine-test's immutable_patterns (.*.apk$),
+        # but since is_mutable_file returns True it must be allowed through.
        response = client.get("/api/v1/remote/alpine-test/alpine/v3.18/x86_64/APKINDEX.tar.gz")
        assert response.status_code == 200

+    def test_mutable_unchanged_refreshes_ttl_without_redownload(self, client, patched_deps):
+        """When check_mutable_updates=True and upstream says 304, TTL is refreshed in place."""
+        deps = patched_deps
+        deps["storage"].exists.return_value = True
+        deps["storage"].download_object.return_value = b"metadata content"
+        # File is mutable and its TTL has expired
+        deps["cache"].is_mutable_file.return_value = True
+        deps["cache"].is_index_valid.return_value = False
+        deps["cache"].get_mutable_meta.return_value = {"etag": '"abc"'}
+
+        with patch("artifactapi.main.check_upstream_changed", new_callable=AsyncMock, return_value=False):
+            response = client.get("/api/v1/remote/check-mutable-test/metadata.json")
+
+        assert response.status_code == 200
+        deps["cache"].mark_index_cached.assert_called()
+        # S3 object must NOT have been deleted (no re-download)
+        deps["storage"].client.delete_object.assert_not_called()
+
+    def test_mutable_changed_triggers_redownload(self, client, patched_deps):
+        """When check_mutable_updates=True and upstream says 200, cache is invalidated."""
+        deps = patched_deps
+        deps["storage"].exists.return_value = False
+        deps["cache"].is_mutable_file.return_value = True
+        deps["cache"].is_index_valid.return_value = False
+        deps["cache"].get_mutable_meta.return_value = {"etag": '"abc"'}
+
+        with patch("artifactapi.main.check_upstream_changed", new_callable=AsyncMock, return_value=True):
+            with patch("artifactapi.main.cache_single_artifact", new_callable=AsyncMock) as mock_cache:
+                mock_cache.return_value = {"status": "error", "error": "upstream gone"}
+                response = client.get("/api/v1/remote/check-mutable-test/metadata.json")
+
+        assert response.status_code == 502
+
+    def test_mutable_flag_off_skips_conditional_check(self, client, patched_deps):
+        """When check_mutable_updates is not set, expired mutable files are always re-fetched."""
+        deps = patched_deps
+        deps["storage"].exists.return_value = False
+        deps["cache"].is_mutable_file.return_value = True
+        deps["cache"].is_index_valid.return_value = False
+
+        with patch("artifactapi.main.check_upstream_changed", new_callable=AsyncMock) as mock_check:
+            with patch("artifactapi.main.cache_single_artifact", new_callable=AsyncMock) as mock_cache:
+                mock_cache.return_value = {"status": "error", "error": "upstream gone"}
+                client.get("/api/v1/remote/custom-index-test/metadata.json")
+
+        mock_check.assert_not_called()
+
    def test_local_repo_file_not_found_returns_404(self, client, patched_deps):
        deps = patched_deps
        deps["database"].get_local_file_metadata.return_value = None
@@ -519,8 +566,8 @@ class TestCacheFlushEndpoint:
        deps["cache"].available = True
        redis_mock = MagicMock()
        deps["cache"].client = redis_mock
-        # First pattern (index:*) returns keys; subsequent pattern returns nothing
-        redis_mock.keys.side_effect = [["index:test:abc", "index:test:def"], []]
+        # index:* returns keys; mutable:meta:* and metrics:* return nothing
+        redis_mock.keys.side_effect = [["index:test:abc", "index:test:def"], [], []]
        deps["storage"].client.list_objects_v2.return_value = {}

        response = client.put("/cache/flush")
Author	SHA1	Message	Date
unkinben	bd1faeee9b	feat: add check_mutable_updates flag for conditional upstream revalidation When check_mutable_updates: true is set on a remote, expired user-defined mutable files are revalidated before re-downloading: - On expiry a conditional HEAD is sent with If-None-Match / If-Modified-Since - 304 Not Modified: TTL is refreshed in Redis, S3 cache is untouched - 200 / no conditional support: cache is invalidated and file re-downloaded - Network error: safe fallback — assume changed, re-download ETag and Last-Modified from upstream responses are stored in Redis under mutable:meta:<remote>:<hash> (no expiry, cleaned up on re-download or cache flush). The flag only applies to user-configured mutable_patterns; built-in package-type defaults (APKINDEX, repomd.xml, Docker manifests) are always re-fetched unconditionally. cache/flush also clears mutable:meta:* keys alongside index:* keys.	2026-04-27 01:00:00 +10:00
unkinben	b50abe304e	chore: track remotes.yaml as a documented example config Remove remotes.yaml from .gitignore and add header comments explaining the immutable_patterns/mutable_patterns/cache keys. Marks the file clearly as an example to copy and adapt; warns against committing real credentials.	2026-04-27 00:40:55 +10:00
unkinben	ce01a94141	feat: rename include/index patterns to immutable/mutable with per-remote TTL Replace the include_patterns/index_patterns split with a clearer immutable_patterns/mutable_patterns model: - immutable_patterns: artifacts cached indefinitely (no TTL) - mutable_patterns: artifacts that expire and are re-fetched after cache.mutable_ttl seconds (replaces cache.index_ttl) _PACKAGE_INDEX_PATTERNS renamed to _PACKAGE_MUTABLE_PATTERNS; all built-in package-type index patterns (APKINDEX, repomd, manifests, etc.) default to the remote's mutable_ttl (default 1 hour). cache.file_ttl renamed to cache.immutable_ttl for consistency. Adds github-archive remote to remotes.yaml as a worked example showing tag archives as immutable and branch archives as mutable (1-day TTL). docker-compose.yml: fix VERSION=dev → 2.2.2.dev0 (valid PEP 440), add :z SELinux label to volume mounts.	2026-04-27 00:40:13 +10:00
unkinben	4619ae18d8	Merge pull request 'chore: remove build from tag' (#13 ) from benvin/docker-compose-build into master Reviewed-on: #13	2026-04-25 22:29:48 +10:00
unkinben	ac51d3a51d	chore: remove build from tag ci/woodpecker/pr/test Pipeline was successful Details ci/woodpecker/pr/pre-commit Pipeline was successful Details ci/woodpecker/pr/build Pipeline was successful Details - stop building the image on tag events	2026-04-25 22:27:59 +10:00
unkinben	2887ce4476	Merge pull request 'build: align Dockerfile with packer build and add docker-compose dev mounts' (#12 ) from benvin/packer-aligned-dockerfile into master ci/woodpecker/tag/docker Pipeline was successful Details Reviewed-on: #12	2026-04-25 22:23:59 +10:00
unkinben	9e52929d73	build: align Dockerfile with packer build and add docker-compose dev mounts ci/woodpecker/pr/pre-commit Pipeline was successful Details ci/woodpecker/pr/test Pipeline was successful Details ci/woodpecker/pr/build Pipeline was successful Details - Rebase Dockerfile onto almalinux9-base, install via uv tool install - Remove dev artifacts (remotes.yaml, ca-bundle.pem) from image - Mount gitignored dev files via docker-compose volumes instead - Add .dockerignore to keep secrets out of build context - Track docker-compose.yml in git (no secrets; dev files mounted as volumes)	2026-04-25 22:17:36 +10:00